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CorFlags.exe (CorFlags Conversion Tool)

In this article

The CorFlags Conversion tool allows you to configure the CorFlags section of the header of a portable executable image.

This tool is automatically installed with Visual Studio. To run the tool, use the Developer Command Prompt for Visual Studio (or the Visual Studio Command Prompt in Windows 7). For more information, see Command Prompts.

At the command prompt, type the following:

Syntax

CorFlags.exe assembly [options]

Parameters

Required parameter

Description

assembly

The name of the assembly for which to configure the CorFlags.

Option

Description

/32BIT[REQ]+

Sets the 32BITREQUIRED flag.

/32BIT[REQ]-

Clears the 32BITREQUIRED flag.

/32BITPREF+

Sets the 32BITPREFERRED flag. The app runs as a 32-bit process even on 64-bit platforms. Set this flag only on EXE files. If the flag is set on a DLL, the DLL fails to load in 64-bit processes, and a BadImageFormatException exception is thrown. An EXE file with this flag can be loaded into a 64-bit process.

New in the .NET Framework 4.5.

/32BITPREF-

Clears the 32BITPREFERRED flag.

New in the .NET Framework 4.5.

/?

Displays command syntax and options for the tool.

/Force

Forces an update even if the assembly is strong-named. Important: If you update a strong-named assembly, you must sign it again before executing its code.

/help

Displays command syntax and options for the tool.

/ILONLY+

Sets the ILONLY flag.

/ILONLY-

Clears the ILONLY flag.

/nologo

Suppresses the Microsoft startup banner display.

/RevertCLRHeader

Reverts the CLR header version to 2.0.

/UpgradeCLRHeader

Upgrades the CLR header version to 2.5. Note: Assemblies must have a CLR header version of 2.5 or greater to run natively.

Remarks

If no options are specified, the CorFlags Conversion tool displays the flags for the specified assembly.